track_distance_plus {
	+ keyboard   GreyPageDown
}
track_distance_minus {
	+ keyboard   GreyDelete
}
overview_zoom_plus {
	+ keyboard	GreyDelete
}
overview_zoom_minus {
	+ keyboard	GreyPageDown
}
zoom_factor_plus {
	+ keyboard	GreyDelete
}
zoom_factor_minus {
	+ keyboard	GreyPageDown
}
zoom_factor_reset {
	+ keyboard	GreyEnd
}